As shown in Fig. 5 (h–l) and Fig. 8

As shown in Fig. 5 (h–l) and Fig. 8 (c) inset, nanoflower-like structures
were formed randomly on the surface layer of the ZnO nanorods.
The nanoflowers are typically ~1 μm in length and ~500 nm in diameter,
and the growth increases more along the b2110> rather than the
b0001> direction [1] compared to those of nanorods e.g. ~350 nm in
length and ~50 nm in diameter. The SEM image illustrates that the
nanoflowers are composed of hexagonal nanorods with a sharp tip.